US4318146A - Rotary head assembly - Google Patents

Rotary head assembly Download PDF

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Publication number
US4318146A
US4318146A US06/107,837 US10783779A US4318146A US 4318146 A US4318146 A US 4318146A US 10783779 A US10783779 A US 10783779A US 4318146 A US4318146 A US 4318146A
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US
United States
Prior art keywords
heads
head
tape
tracks
magnetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/107,837
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English (en)
Inventor
Kazuo Ike
Katsuichi Tachi
Tetsuro Kato
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Sony Corp
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Sony Corp
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Publication date
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Publication of US4318146A publication Critical patent/US4318146A/en
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
    • G11B5/53—Disposition or mounting of heads on rotating support
    • G11B5/531—Disposition of more than one recording or reproducing head on support rotating cyclically around an axis
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/29—Structure or manufacture of unitary devices formed of plural heads for more than one track

Definitions

  • This invention relates to a rotary head assembly for use in a multihead tape recording apparatus, and more particularly to such an assembly that supports a plurality of magnetic heads aligned substantially in a head scanning direction.
  • One of the methods to perform such high density recording is carried out by adopting a rotary head system employed presently in manufacture of video tape recorders, which are generally classified into one-head type, two-head 180° wrap type and four-head type.
  • Another technique relating thereto is termed multitrack recording which divides an input signal into a plurality of channels and records the same in a plurality of tracks simultaneously.
  • This method is adopted in manufacture of fixed head type PCM (pulse code modulation) audio recorders.
  • PCM pulse code modulation
  • the above two techniques may be combined for producing multitrack rotary scan type recorders.
  • the problem arising in this resides in the structure of a rotary scan type multihead assembly. Since the width of each track becomes even less than 30 microns to achieve high density recording, extremely great difficulties are unavoidable in aligning such thin heads.
  • a head base plate is provided for each of head chips and, when mounting the base plate, a spacer is inserted to adjust the height of each effective head gap.
  • This method has some disadvantages including increase in the number of component elements and also troublesome adjustment. Furthermore, it has been impossible heretofore to dispose the individual heads in the immediate proximity of each other.
  • the principal object of the present invention is to provide a novel head assembly for use in a rotary scan type multitrack recording apparatus, wherein a plurality of magnetic heads are mounted on a single head base plate in a multihead scan system.
  • a plurality of head chips or pieces are aligned substantially in a head scanning direction. Although all head chips have the same thickness, the heights of the effective gaps thereof are rendered different individually from one another by cutting the head chips in a predetermined manner.
  • the heights of the effective gaps may be so selected as not to form a guard band between tracks.
  • the heads For the purpose of preventing crosstalk during reproduction, it is necessary for the heads to have different gap angles in forming adjacent tracks on a magnetic tape. This type of recording method is called "azimuth recording". The crosstalk between adjacent tracks is avoided by azimuth loss of recording principle.
  • the head base plate is mounted on an upper rotary drum around which a magnetic recording tape wraps and is moved.
  • On the periphery of the upper rotary drum there is formed a head window through which the plural heads contact and scan the magnetic tape to form a plurality of parallel tracks substantially at the same time.
  • FIG. 1 is a schematic perspective view of a rotary drum device in which a magnetic head assembly is incorporated;
  • FIG. 2 is a schematic plan view showing the state where a magnetic tape is wound around the rotary drum device
  • FIG. 3 is an enlarged front view of a principal part of the rotary drum device in which a magnetic head assembly of this invention is employed;
  • FIG. 4 is a sectional plan view taken along the line IV--IV in FIG. 3;
  • FIG. 5 is an enlarged front view of head chips in one embodiment of the magnetic head assembly according to this invention.
  • FIG. 6 is an enlarged front view of head chips in another embodiment different from FIG. 5;
  • FIG. 7 is a partially cutaway plan view of a magnetic tape illustrating an exemplary track pattern formed by the head assembly of this invention
  • FIG. 8 is a partially cutaway plan view of a magnetic tape illustrating another track pattern different from FIG. 7;
  • FIG. 9 is a partially cutaway plan view of a magnetic tape illustrating another example of track pattern different from FIGS. 7 and 8.
  • a recording and/or reproducing apparatus equipped with a rotary head assembly of the present invention has a structure such as that shown in FIGS. 1 and 2, in which a rotary upper drum 1 and a stationary lower drum 2 constitute a tape guide system 3.
  • the rotary upper drum 1 is rotated by a motor 5 through a shaft 4.
  • the upper drum 1 is driven preferably at a speed of 60 r.p.s.
  • a magnetic tape 6 is guided by a pair of guide pins 7 and 8 as illustrated in FIG. 1 and is thereby wound around the periphery of the tape guide system 3 substantially over 350°.
  • the rotary upper drum 1 has a head window 9, from which a plurality of magnetic heads of a head assembly 10 protrude to scan the magnetic tape 6.
  • the head assembly 10 includes a head base plate 11 and a plurality of magnetic head chips 12, 13 and 14, as shown in FIGS. 3 and 4.
  • the head base plate 11 has a screw hole 20 and is secured on the rotary upper drum 1 by means of a screw (not shown).
  • the head base plate 11 has a plurality of slits 15, 16 and 17. These slits are provided for winding coils for each head.
  • FIGS. 5 and 6 illustrate the surface of the head base plate 11 with the position and angle of the effective gap in each head, wherein a reference numeral 18 denotes the top surface of the head base plate 11.
  • the heads respectively have effective gaps 21, 22 and 23 at individually different heights from the top surface 18.
  • the width and height of each head gap is so selected as to form a guard band between recorded tracks.
  • the thickness t is the same in all heads, but the effective gaps thereof are rendered different from one another by proper cutting of the head chips.
  • FIG. 6 is suited particularly for a higher-density recording operation, wherein guardband-less recording is performed.
  • the effective gaps 27, 28 and 29 have individually different angles against the top surface 18, as represented by one-dot chain lines.
  • occurrence of crosstalk between adjacent heads is avoidable by the azimuth loss.
  • the entire heads 24, 25 and 26 in the example of FIG. 6 also have the same thickness.
  • FIGS. 7 through 9 illustrate track patterns formed by using the rotary head assembly of this invention.
  • FIG. 7 shows one example of a recording pattern obtained when the embodiment of FIG. 5 is applied.
  • a plurality of tracks 30A, 30B and 30C are respectively separated by guard bands 40.
  • These tracks 30A, 30B and 30C are formed substantially at the same time by one rotation of the upper rotary drum 1, and the succeeding rotation of the drum 1 forms another triad of parallel tracks 31A, 31B and 31C.
  • FIGS. 8 and 9 illustrate recording patterns obtained when the embodiment of FIG. 6 is applied.
  • tracks 35A, 35B and 35C are formed by one rotation of the upper rotary drum 1, and there exists no guard band area between tracks.
  • Another rotation of the drum 1 forms tracks 36A, 36B and 36C.
  • Tracks 38A, 38B and 38C are formed by one rotation of the upper drum 1, and the succeeding rotation thereof forms another triad of tracks 39A, 39B and 39C.
  • the explanation has been given merely on a three-channel system alone.
  • the present invention is of course, applicable to a two-channel system and a four-channel system as well.
  • four head chips are aligned in a head scanning direction.
  • four heads are mounted on a single head base plate as in the foregoing examples.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Magnetic Heads (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
US06/107,837 1978-12-29 1979-12-28 Rotary head assembly Expired - Lifetime US4318146A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP16226678A JPS5593530A (en) 1978-12-29 1978-12-29 Magnetic head unit
JP53-162266 1978-12-29

Publications (1)

Publication Number Publication Date
US4318146A true US4318146A (en) 1982-03-02

Family

ID=15751175

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/107,837 Expired - Lifetime US4318146A (en) 1978-12-29 1979-12-28 Rotary head assembly

Country Status (9)

Country Link
US (1) US4318146A (de)
JP (1) JPS5593530A (de)
AT (1) AT369912B (de)
AU (1) AU539005B2 (de)
CA (1) CA1143059A (de)
DE (1) DE2952627A1 (de)
FR (1) FR2445576B1 (de)
GB (1) GB2039126B (de)
NL (1) NL189688C (de)

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4390915A (en) * 1979-12-11 1983-06-28 Sony Corporation Helical scan type video tape recorder
US4392162A (en) * 1979-10-04 1983-07-05 Sony Corporation Digital video signal reproducing apparatus
US4408240A (en) * 1979-08-23 1983-10-04 Rca Corporation Multichannel magnetic head for a recorder-reproducer system
US4486792A (en) * 1980-12-27 1984-12-04 Canon Kabushiki Kaisha Magnetic recording and reproducing device
US4497005A (en) * 1981-06-02 1985-01-29 Robert Bosch Gmbh Multiple magnetic transducer head, particularly for use with multi-track video tape recording apparatus
US4541020A (en) * 1981-07-22 1985-09-10 Olympus Optical Co., Ltd. Data recording/reproducing apparatus
US4609960A (en) * 1982-07-30 1986-09-02 Tokyo Shibaura Denki Kabushiki Kaisha Rotary thin film magnetic head device
US4691260A (en) * 1983-09-16 1987-09-01 Mitsubishi Denki Kabushiki Kaisha Tunnel erase magnetic head assembly
US4723176A (en) * 1984-11-28 1988-02-02 Sony Corporation Video tape recorders
US4819099A (en) * 1986-01-16 1989-04-04 Sony Corporation Apparatus for longitudinal bidirectional recording with equal length tracks
US4839754A (en) * 1987-02-26 1989-06-13 Micropolis Corporation Winchester disk drive motor circuitry
US4860132A (en) * 1981-12-24 1989-08-22 U.S. Philips Corporation Rotatable head assembly with offset sub-head gaps
US4922359A (en) * 1987-08-27 1990-05-01 Alps Electric Co., Ltd. Rotary head type digital audio tape recorder
US4928186A (en) * 1987-08-31 1990-05-22 Fuji Photo Film Co., Ltd. Magnetic recording method and magnetic head
US4939607A (en) * 1987-10-16 1990-07-03 Sony Corporation Head carriage for use with a longitudinal recording system utilizing a rotary recording and/or reproducing head
US5130875A (en) * 1989-07-12 1992-07-14 Hitachi, Ltd. Multichannel magnetic head having a plurality of head chips fixed on a common head base
USRE34399E (en) * 1987-02-26 1993-10-05 Micropolis Corporation Winchester disk drive motor circuitry
US5295032A (en) * 1991-03-20 1994-03-15 Sony Corporation Rotary magnetic head device
US5426550A (en) * 1990-06-08 1995-06-20 Matsushita Electric Industrial Co., Ltd. Multitrack magnetic head assembly for scanning a magnetic tape with a plurality of magnetic head tips
US5689390A (en) * 1994-04-28 1997-11-18 U.S. Philips Corporation Scanning device for a magnetic-tape apparatus
US5978185A (en) * 1995-12-27 1999-11-02 Hitachi Ltd. Rotary head and recording/reading apparatus provided with rotary head
US20030218092A1 (en) * 2000-08-21 2003-11-27 Anderson James C. Tape guide with wear resistant coating
US20040174628A1 (en) * 2003-03-05 2004-09-09 Schwarz Theodore A. Large angle azimuth recording and head configurations
US20050259353A1 (en) * 2004-05-18 2005-11-24 Exabyte Corporation Multi-plane thin-film heads
US20090097155A1 (en) * 1999-02-23 2009-04-16 Advanced Research Corporation Magnetic media having a servo track written with a patterned magnetic recording head
US20090262456A1 (en) * 2008-03-28 2009-10-22 Dugas Matthew P Method of formatting magnetic media using a thin film planar arbitrary gap pattern magnetic head
US20090262452A1 (en) * 1999-12-30 2009-10-22 Dugas Matthew P Multichannel time based servo tape media
US20100284105A1 (en) * 2004-01-30 2010-11-11 Dugas Matthew P Apparatuses and methods for pre-erasing during manufacture of magnetic tape
US20100296192A1 (en) * 1999-02-23 2010-11-25 Advanced Research Corporation Patterned magnetic recording head with termination pattern
US20100321824A1 (en) * 2004-02-18 2010-12-23 Dugas Matthew P Magnetic recording head having secondary sub-gaps
US20110002065A1 (en) * 2008-01-23 2011-01-06 Dugas Matthew P Recording heads with embedded tape guides and magnetic media made by such recording heads
US20110043940A1 (en) * 2009-07-31 2011-02-24 Gregory Lawrence Wagner Erase drive system and methods of erasure for tape data cartridge
US20110141604A1 (en) * 2004-05-04 2011-06-16 Dugas Matthew P Magnetic media formatted with an intergrated thin film subgap subpole structure for arbitrary gap pattern magnetic recording head
US8144424B2 (en) 2003-12-19 2012-03-27 Dugas Matthew P Timing-based servo verify head and magnetic media made therewith

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3031761A1 (de) * 1979-08-23 1981-03-12 RCA Corp., 10020 New York, N.Y. Mehrkanalmagnetkopf fuer ein aufnahme-wiedergabe-system
DE3273539D1 (en) * 1981-06-08 1986-11-06 Hitachi Ltd Azimuthal magnetic recording and reproducing apparatus
GB2111288B (en) * 1981-11-20 1985-04-11 Sony Corp Magnetic tape recording and reproducing arrangements
JPS5998307A (ja) * 1982-11-29 1984-06-06 Hitachi Ltd 記録および／または再生装置
JPH0666096B2 (ja) * 1984-07-27 1994-08-24 株式会社日立製作所 磁気記録再生装置
JPS61157193A (ja) * 1984-12-28 1986-07-16 Victor Co Of Japan Ltd 映像信号再生装置
JPH052937Y2 (de) * 1985-11-29 1993-01-25
JPH0427286A (ja) * 1990-05-22 1992-01-30 Sony Corp Ｖｔｒ
US5065267A (en) * 1990-07-20 1991-11-12 Matsushita Electric Industrial Co., Ltd. Multi-track magnetic head having different height head chips
JPH08202198A (ja) * 1995-01-31 1996-08-09 Nec Corp 電子写真装置の定着装置

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US3721773A (en) * 1970-10-09 1973-03-20 Ampex Magnetic head transducer assembly for redundantly recording data on and reproducing data from dual-tracks of a magnetic recording medium
JPS5240112A (en) * 1975-09-25 1977-03-28 Sony Corp Recorder and reproducer of image signals
US4040109A (en) * 1975-08-11 1977-08-02 Igor Alexeevich Kryltsov Tape transport system of video tape recorder with longitudinal recording
NL7801929A (nl) * 1977-02-24 1978-08-28 Sony Corp Inrichting voor weergave van videosignalen.
DE2814082A1 (de) * 1977-04-01 1978-10-05 Victor Company Of Japan Videosignal-wiedergabesystem mit geschwindigkeitswechsel
US4165523A (en) * 1976-03-19 1979-08-21 Ampex Corporation Automatic scan tracking using an additional sensing means on a bimorph
US4199793A (en) * 1977-03-24 1980-04-22 Independent Broadcasting Authority Digital recording

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NL264765A (de) * 1961-05-15
US3290438A (en) * 1963-10-25 1966-12-06 Okamura Shiro Recording and reproducing system having redundant recording and selective reproduction
US3761611A (en) * 1970-06-23 1973-09-25 Hitachi Ltd And Hitachi Electr Video file system
JPS5756265B2 (de) * 1974-04-17 1982-11-29
JPS6011507B2 (ja) * 1976-07-30 1985-03-26 ソニー株式会社 記録再生装置
JPS5357012A (en) * 1976-11-04 1978-05-24 Tdk Corp Magnetic recording device
DE2754353C3 (de) * 1977-12-07 1982-04-22 Grundig E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig & Co KG, 8510 Fürth Anordnung zur Aufzeichnung und Wiedergabe von Einzelbildern

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3721773A (en) * 1970-10-09 1973-03-20 Ampex Magnetic head transducer assembly for redundantly recording data on and reproducing data from dual-tracks of a magnetic recording medium
US4040109A (en) * 1975-08-11 1977-08-02 Igor Alexeevich Kryltsov Tape transport system of video tape recorder with longitudinal recording
JPS5240112A (en) * 1975-09-25 1977-03-28 Sony Corp Recorder and reproducer of image signals
US4165523A (en) * 1976-03-19 1979-08-21 Ampex Corporation Automatic scan tracking using an additional sensing means on a bimorph
NL7801929A (nl) * 1977-02-24 1978-08-28 Sony Corp Inrichting voor weergave van videosignalen.
US4199793A (en) * 1977-03-24 1980-04-22 Independent Broadcasting Authority Digital recording
DE2814082A1 (de) * 1977-04-01 1978-10-05 Victor Company Of Japan Videosignal-wiedergabesystem mit geschwindigkeitswechsel

Cited By (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4408240A (en) * 1979-08-23 1983-10-04 Rca Corporation Multichannel magnetic head for a recorder-reproducer system
US4392162A (en) * 1979-10-04 1983-07-05 Sony Corporation Digital video signal reproducing apparatus
US4390915A (en) * 1979-12-11 1983-06-28 Sony Corporation Helical scan type video tape recorder
US4486792A (en) * 1980-12-27 1984-12-04 Canon Kabushiki Kaisha Magnetic recording and reproducing device
US4497005A (en) * 1981-06-02 1985-01-29 Robert Bosch Gmbh Multiple magnetic transducer head, particularly for use with multi-track video tape recording apparatus
US4541020A (en) * 1981-07-22 1985-09-10 Olympus Optical Co., Ltd. Data recording/reproducing apparatus
US4860132A (en) * 1981-12-24 1989-08-22 U.S. Philips Corporation Rotatable head assembly with offset sub-head gaps
US4609960A (en) * 1982-07-30 1986-09-02 Tokyo Shibaura Denki Kabushiki Kaisha Rotary thin film magnetic head device
US4691260A (en) * 1983-09-16 1987-09-01 Mitsubishi Denki Kabushiki Kaisha Tunnel erase magnetic head assembly
US4723176A (en) * 1984-11-28 1988-02-02 Sony Corporation Video tape recorders
US4819099A (en) * 1986-01-16 1989-04-04 Sony Corporation Apparatus for longitudinal bidirectional recording with equal length tracks
US4839754A (en) * 1987-02-26 1989-06-13 Micropolis Corporation Winchester disk drive motor circuitry
USRE34399E (en) * 1987-02-26 1993-10-05 Micropolis Corporation Winchester disk drive motor circuitry
US4922359A (en) * 1987-08-27 1990-05-01 Alps Electric Co., Ltd. Rotary head type digital audio tape recorder
US4928186A (en) * 1987-08-31 1990-05-22 Fuji Photo Film Co., Ltd. Magnetic recording method and magnetic head
US4939607A (en) * 1987-10-16 1990-07-03 Sony Corporation Head carriage for use with a longitudinal recording system utilizing a rotary recording and/or reproducing head
US5130875A (en) * 1989-07-12 1992-07-14 Hitachi, Ltd. Multichannel magnetic head having a plurality of head chips fixed on a common head base
US5426550A (en) * 1990-06-08 1995-06-20 Matsushita Electric Industrial Co., Ltd. Multitrack magnetic head assembly for scanning a magnetic tape with a plurality of magnetic head tips
US5543990A (en) * 1990-06-08 1996-08-06 Matsushita Electric Industrial Co., Ltd. Multitrack magnetic head assembly for scanning a magnetic tape with a plurality of magnetic head tips
US5295032A (en) * 1991-03-20 1994-03-15 Sony Corporation Rotary magnetic head device
US5689390A (en) * 1994-04-28 1997-11-18 U.S. Philips Corporation Scanning device for a magnetic-tape apparatus
US5978185A (en) * 1995-12-27 1999-11-02 Hitachi Ltd. Rotary head and recording/reading apparatus provided with rotary head
US20100296192A1 (en) * 1999-02-23 2010-11-25 Advanced Research Corporation Patterned magnetic recording head with termination pattern
US20090097155A1 (en) * 1999-02-23 2009-04-16 Advanced Research Corporation Magnetic media having a servo track written with a patterned magnetic recording head
US8437103B2 (en) 1999-12-30 2013-05-07 Advanced Research Corporation Multichannel time based servo tape media
US8542457B2 (en) 1999-12-30 2013-09-24 Advanced Research Corporation Method of making a multi-channel time based servo tape media
US8254052B2 (en) 1999-12-30 2012-08-28 Advanced Research Corporation Method of making a multi-channel time based servo tape media
US20090262452A1 (en) * 1999-12-30 2009-10-22 Dugas Matthew P Multichannel time based servo tape media
US20100002335A1 (en) * 1999-12-30 2010-01-07 Dugas Matthew P Method of making a multi-channel time based servo tape media
US7948705B2 (en) 1999-12-30 2011-05-24 Advanced Research Corporation Method of making a multi-channel time based servo tape media
US20030218092A1 (en) * 2000-08-21 2003-11-27 Anderson James C. Tape guide with wear resistant coating
US6947247B2 (en) 2003-03-05 2005-09-20 Advanced Research Corporation Large angle azimuth recording and head configurations
US20040174628A1 (en) * 2003-03-05 2004-09-09 Schwarz Theodore A. Large angle azimuth recording and head configurations
US8144424B2 (en) 2003-12-19 2012-03-27 Dugas Matthew P Timing-based servo verify head and magnetic media made therewith
US20100284105A1 (en) * 2004-01-30 2010-11-11 Dugas Matthew P Apparatuses and methods for pre-erasing during manufacture of magnetic tape
US20100321824A1 (en) * 2004-02-18 2010-12-23 Dugas Matthew P Magnetic recording head having secondary sub-gaps
US8416525B2 (en) 2004-05-04 2013-04-09 Advanced Research Corporation Magnetic media formatted with an intergrated thin film subgap subpole structure for arbitrary gap pattern magnetic recording head
US20110141604A1 (en) * 2004-05-04 2011-06-16 Dugas Matthew P Magnetic media formatted with an intergrated thin film subgap subpole structure for arbitrary gap pattern magnetic recording head
US20050259353A1 (en) * 2004-05-18 2005-11-24 Exabyte Corporation Multi-plane thin-film heads
US20110002065A1 (en) * 2008-01-23 2011-01-06 Dugas Matthew P Recording heads with embedded tape guides and magnetic media made by such recording heads
US8068300B2 (en) 2008-03-28 2011-11-29 Advanced Research Corporation Thin film planar arbitrary gap pattern magnetic head
US8068302B2 (en) 2008-03-28 2011-11-29 Advanced Research Corporation Method of formatting magnetic media using a thin film planar arbitrary gap pattern magnetic head
US8068301B2 (en) 2008-03-28 2011-11-29 Advanced Research Corporation Magnetic media formed by a thin film planar arbitrary gap pattern magnetic head
US20090262456A1 (en) * 2008-03-28 2009-10-22 Dugas Matthew P Method of formatting magnetic media using a thin film planar arbitrary gap pattern magnetic head
US20100027153A1 (en) * 2008-03-28 2010-02-04 Dugas Matthew P Thin film planar arbitrary gap pattern magnetic head
US20100027164A1 (en) * 2008-03-28 2010-02-04 Dugas Matthew P Magnetic media formed by a thin planar arbitrary gap pattern magnetic head
US20110043940A1 (en) * 2009-07-31 2011-02-24 Gregory Lawrence Wagner Erase drive system and methods of erasure for tape data cartridge
US8767331B2 (en) 2009-07-31 2014-07-01 Advanced Research Corporation Erase drive system and methods of erasure for tape data cartridge

Also Published As

Publication number Publication date
NL7909324A (nl) 1980-07-01
NL189688B (nl) 1993-01-18
FR2445576A1 (fr) 1980-07-25
ATA817079A (de) 1982-06-15
DE2952627A1 (de) 1980-07-10
GB2039126A (en) 1980-07-30
JPS5593530A (en) 1980-07-16
FR2445576B1 (fr) 1987-05-22
CA1143059A (en) 1983-03-15
DE2952627C2 (de) 1989-01-05
AU5408279A (en) 1980-07-03
AU539005B2 (en) 1984-09-06
GB2039126B (en) 1983-05-11
AT369912B (de) 1983-02-10
JPS624769B2 (de) 1987-01-31
NL189688C (nl) 1993-06-16

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